Shoahey: WGT deem it otherwise and have you restart from the 1st hole to determine who the winner is.
Yep - see the match play rules in the FAQs =>
Shoahey: If both players decide to end the game before teeing off, why doesn't WGT award XP, after all I earned it?
Error 1: There are XPs given for the strokes you took, they are awarded one by one, see the flash on the XP meter after each of your shots.
Error 2: The big bunch of XPs are awarded on completion of a game, and it's not completed on a tie, see above. IIRC, even a "concede match" will leave the game uncompleted, dunno about a "concede hole".